RequestPayment

Signature

WeChat Pay APIs have two versions of signature: V2 and V3. Developers must use the correct version of the API and the corresponding signature to avoid errors like "Signature Mismatch".

API_V2

• For the V2 Order API, use the V2 Signature.

API_V3

• For the V3 Order API, use the V3 Signature.

Parameters

Property	Type	Default Value	Required	Description
mchId	string		Yes	Merchant ID
prepayId	string		Yes	Prepayment transaction session ID
nonceStr	string		Yes	Random string
package	string		Yes	Random string, usually fixed value: Sign=WXPay
timeStamp	string		Yes	Timestamp
sign	string		Yes	Signature; Note: The signature method must match the one used in the unified order interface. V2 and V3 signatures are described above.

Example

window.Wechat.requestPayment({
    timeStamp: '1667792176',
    mchId: '1800009365',
    prepayId: 'wx07113616363804b19dde94884922030000',
    package: 'Sign=WXPay',
    nonceStr: '8ne443gjxxg',
    sign: '4FF5900870B5C5BCB089789BC004156426C46512CE566DB17C131747E09ADEBA'
  },
  function(res) {
    console.warn('requestPayment success:', res);
  },
  function(err) {
    console.error(err);
  }
);